/// <summary>
/// Initializes a new instance of the ShapefileHeader class with values read in from the stream.
/// </summary>
/// <remarks>Reads the header information from the stream.</remarks>
/// <param name="shpBinaryReader">BigEndianBinaryReader stream to the shapefile.</param>
public ShapefileHeader(BigEndianBinaryReader shpBinaryReader)
{
if (shpBinaryReader == null)
throw new ArgumentNullException("shpBinaryReader");
_fileCode = shpBinaryReader.ReadInt32BE();
if (_fileCode != Shapefile.ShapefileId)
throw new ShapefileException("The first four bytes of this file indicate this is not a shape file.");
// skip 5 unsed bytes
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
_fileLength = shpBinaryReader.ReadInt32BE();
_version = shpBinaryReader.ReadInt32();
Debug.Assert(_version == 1000, "Shapefile version", String.Format("Expecting only one version (1000), but got {0}",_version));
int shapeType = shpBinaryReader.ReadInt32();
_shapeType = (ShapeGeometryType) EnumUtility.Parse(typeof(ShapeGeometryType), shapeType.ToString());
//read in and store the bounding box
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
coords[i] = shpBinaryReader.ReadDouble();
_bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// skip z and m bounding boxes.
for (int i = 0; i < 4; i++)
shpBinaryReader.ReadDouble();
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_shpBinaryReader.PeekChar() != -1)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, _parent._geometryFactory);
}
catch (Exception)
{
return(false);
}
return(true);
}
else
{
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_shpBinaryReader.BaseStream.Position < _shpBinaryReader.BaseStream.Length)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, contentLength, _parent._geometryFactory);
}
catch (Exception ex)
{
// actually we should remove this crap...
Trace.WriteLine(ex.Message);
return(false);
}
return(true);
}
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
/// <summary>
/// Initializes a new instance of the ShapefileHeader class with values read in from the stream.
/// </summary>
/// <remarks>Reads the header information from the stream.</remarks>
/// <param name="shpBinaryReader">BigEndianBinaryReader stream to the shapefile.</param>
public ShapefileHeader(BigEndianBinaryReader shpBinaryReader)
{
if (shpBinaryReader == null)
{
throw new ArgumentNullException("shpBinaryReader");
}
_fileCode = shpBinaryReader.ReadInt32BE();
if (_fileCode != Shapefile.ShapefileId)
{
throw new ShapefileException("The first four bytes of this file indicate this is not a shape file.");
}
// skip 5 unsed bytes
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
shpBinaryReader.ReadInt32BE();
_fileLength = shpBinaryReader.ReadInt32BE();
_version = shpBinaryReader.ReadInt32();
Debug.Assert(_version == 1000, "Shapefile version", String.Format("Expecting only one version (1000), but got {0}", _version));
int shapeType = shpBinaryReader.ReadInt32();
_shapeType = (ShapeGeometryType)EnumUtility.Parse(typeof(ShapeGeometryType), shapeType.ToString());
//read in and store the bounding box
double[] coords = new double[4];
for (int i = 0; i < 4; i++)
{
coords[i] = shpBinaryReader.ReadDouble();
}
_bounds = new Envelope(coords[0], coords[2], coords[1], coords[3]);
// skip z and m bounding boxes.
for (int i = 0; i < 4; i++)
{
shpBinaryReader.ReadDouble();
}
}
